Message posted by ericmark on 07/12/2018 at 4:26am
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I was unsure if the power supply design would or would not work without a battery, so I used a very small 7 Ah battery which worked well.
It does not only depend on the power supply, but also what one runs off 12 volt, my old caravan had half 230 volt and half 12 volt lighting, the new one is all 12 volt.
In the old days I used a CB power supply, but although a 3 amp power supply is only £17 and 5 amp £19 but time you hit 20 amp the price is £60 (Amazon prices) so you need to get some info first.
1) How much 12 volt power do you need.
2) What does it say on your existing power supply.
Some times your lucky, you find the model number, do internet hunt and find all details, other times you can't find a thing.
As well as reverse polarity protection you also get switch mode devices which are not smoothed, switch mode means less heat and works as name suggests by switching on and off and adjusting the ratio between on and off time so average is 13.8 volt, some have a large capacitor to smooth the output, other rely on the battery to smooth output.