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Subject Topic: Lithium Batteries Post Reply Post New Topic
Message posted by lidds0 via mobile 19/7/2021 at 10:18am
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Can some knowledgeable person advise me please.

I need to power a 12v pump (which fixes to car battery terminals) away from the vehicle, but don't want to carry a big leisure battery and battery box to do so.

Some kind person on another thread has recommended these lithium batteries.

I want to keep weight and battery size down. I presume that only the 50Ah battery would power a pump with 45 amp start draw? But,that makes it too big, heavy and expensive.

If I get a pump with a 30 amp draw, would the 20Ah or the 30Ah battery be best? (Both state max draw of 30Ah, so I'm confused).

Has anyone experience of this make of battery?

Thoughts and recommendations welcome please.

Message posted by marg619/7/2021 at 3:11pm
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does it really have to be a powered pump? couldnt you use something such as the ones from the top of a 5 ltr container? or even the sort from an old caravan. failing that a motorcycle battery would do the job and no where near as heavy to move around and then just connect a 15w solar panel on it to recharge it no need for a controller then

Message posted by Bernie4719/7/2021 at 6:51pm
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Quote: Originally posted by lidds0 on 19/7/2021

I presume that only the 50Ah battery would power a pump with 45 amp start draw? But,that makes it too big, heavy and expensive.




50Ah is the capacity of the battery, not the current rating.
If the pump has a starting current of 45A then the running current will probably be in the region of 8A.
If you are worried about the starting current, which will only be for a few seconds, you could fit a current limiter.

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Bernie

Message posted by lidds0 via mobile 20/7/2021 at 11:21pm
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Quote: Originally posted by marg6 on 19/7/2021
does it really have to be a powered pump? couldnt you use something such as the ones from the top of a 5 ltr container? or even the sort from an old caravan. failing that a motorcycle battery would do the job and no where near as heavy to move around and then just connect a 15w solar panel on it to recharge it no need for a controller then



Sorry, I should have made myself more clear. I meant a 12v tyre inflator / compressor / tent pump.

Message posted by lidds0 via mobile 20/7/2021 at 11:23pm
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Quote: Originally posted by Bernie47 on 19/7/2021
Quote: Originally posted by lidds0 on 19/7/2021

I presume that only the 50Ah battery would power a pump with 45 amp start draw? But,that makes it too big, heavy and expensive.




50Ah is the capacity of the battery, not the current rating.
If the pump has a starting current of 45A then the running current will probably be in the region of 8A.
If you are worried about the starting current, which will only be for a few seconds, you could fit a current limiter.




I was looking at the maximum charge current for each battery Bernie. Is that not right?

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Message posted by marg621/7/2021 at 5:25am
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ok well i still say the same thing, motorbike battery will do your job and be a lot lighter to carry, we inflate a couple of dingies and kayaks using one

Message posted by lidds0 via mobile 21/7/2021 at 12:00pm
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Which one do you use Marg6?

Message posted by Bernie4721/7/2021 at 9:37pm
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Quote: Originally posted by lidds0 on 20/7/2021
I was looking at the maximum charge current for each battery Bernie. Is that not right?



50 amp hours is the capacity of the battery, nothing to do with the charge or discharge rate.

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Message posted by lidds0 via mobile 21/7/2021 at 9:49pm
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I understand that, but was looking in the table for these batteries, where it states 'maximum charge / discharge current' and it looks like only 1 supports a 45 amp draw? Or am I wrong?

Message posted by Bernie4721/7/2021 at 10:47pm
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The 45 amp starting current will only last a matter of seconds.
It is the running current that should be considered.

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Bernie

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Message posted by lidds0 via mobile 22/7/2021 at 5:56am
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I've checked and the running current of the inflator we've just bought is 537 watts, so on 12v is 44.7 amps (I used a converter)? So a 20Ah lithium battery would last about 20 mins (assuming lithium batteries can discharge to almost empty)?

Am thinking this pump is too powerful for such a small battery, yes? So is the answer a smaller pump and / or a larger battery?

Message posted by lidds0 via mobile 22/7/2021 at 6:01am
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Ah...the seller has just changed info on the table, it now shows a maximum charge current of 25/30A (stated 30A previously). So now possibly not sufficient even for a pump with 30A draw current?

Message posted by marg622/7/2021 at 7:36am
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without taking my husbands motorbike apart to see it i couldnt say, but i do know we did take one as a back up as our caravan uses a lot of power and on a rally i would never be able to get thr to a sunday morning without the main battery running out

Message posted by marg622/7/2021 at 9:54am
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lidds - after the weekend, when i saw the ease a man inflated his dinghy, not a play one but a full size outboard required type, im buying my husband one of these for his next birthday https://www.direct-powertools.co.uk/ryobi-r18i-0-18v-one-inflator-body-only-c2x13900804 then another 45 for the battery, i wouldnt have considered spending that much on an inflator but this thing was very impressive in all respects and wasnt heavy or awkward to use or move around and was so quiet when being used too

Message posted by lidds0 via mobile 23/7/2021 at 5:22pm
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Thanks Marg6, but the year before last, we got a Ryobi R18I-0 ONE+ inflator, 18 V (body only) plus Ryobi RB18L50 ONE+ Lithium+ 5.0Ah battery and Ryobi RC18150 18V ONE+ cordless 5.0A battery charger. First use, we thought it was great. Second time out, it struggled, shook and died.

It might just be that our tent tubes were just too great a task for it, but I can't recommend it and it's put me off rechargeables.

I think Ryobi brought out a new model last year, maybe that's better? Don't think we'll be risking it again though.

Message posted by lidds0 via mobile 23/7/2021 at 5:28pm
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Quote: Originally posted by marg6 on 22/7/2021
lidds - after the weekend, when i saw the ease a man inflated his dinghy, not a play one but a full size outboard required type, im buying my husband one of these for his next birthday https://www.direct-powertools.co.uk/ryobi-r18i-0-18v-one-inflator-body-only-c2x13900804 then another 45 for the battery, i wouldnt have considered spending that much on an inflator but this thing was very impressive in all respects and wasnt heavy or awkward to use or move around and was so quiet when being used too



I've just checked and, yes, the Ryobi R18MI-0 ONE+ is the model after the one we got.

It might be better but, experience with the last one has made me a bit dubious. 😬


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