So recently installed a dometic crx50 fridge . Realised fridge switches off when battery voltage drops to 11v . So planning doing few night and wanna keep battery topped up. What would be enough amp battery charger to manage ? Sent from my SM-S901B using Tapatalk
10A, I have same fridge and a 10A "smart" charger. It keeps up indefinitely. Those with smaller ones report problems. or 200w of solar.
Cheers was looking and thinking shall grab cheap 1amp to do job as only odd use but will just by 10amp if that what needs Sent from my SM-S901B using Tapatalk
1a would slowly charge your battery if there was no load on it, but those fridges take about 4A when running and average 25-30 Ah/day. If it's hot and they're boxed in with inadequate ventilation (like we do) even more. Pretty sure mine ran about half the time = 12 hours x 4A = 48Ah per day - that's a flat battery after a day or so.
Sounds crazy but was hoping would run battery 2 zero . And is what I thought then mite get day or 2 out of battery . But it switches off at 11v so need get charger Sent from my SM-S901B using Tapatalk
Ah, well, the more you run a battery down the less time it will last. 50% is really the absolute max so you get 50Ah from a 100Ah battery. As for voltage, 11V is pretty much drained, more like 5% SOC (State Of Charge) and pretty well fooked! Do this a few times and you'll be buying another battery before you know it. Don't let it get that discharged. Also it's essential for lead acid batteries to get back to full charge as soon as possible as often as possible. Leave it a week discharged at your peril, your 100Ah will turn into 80 then 50 as it looses capacity. They are pretty crap if you don't stay on top of them. Do not rely on your alternator to recharge it either unless your journey home is 10 hours.
This is why going for a charger that does at least 10A is needed. Otherwise it never really "catches up" with charging the battery when the fridge is on, while hooked up. Go to 12voltplanet.co.uk and pick a charger/maintainer that doesnt take a freaky when the battery charge state actually goes down while the battery is meant to be charging .. e.g. fridge on, lights on and a 20 watt fast phone charge socket ( yes phone chargers are no longer a low current load ) Budget £110-£150.. A week with a battery left at 11 volts you may as well go and get another battery, especially if you have AGM ..the more expensive lead acid batteries that allow deeper cycling 70% rather than 50% depth are much more sensitive to being left flat. I used to have a cheap supply of AGM locally and got through quite a few on my boat leaving the vhf radiotelephone on..
