What best boat battery charger ?

My Sterling Pro Charge Ultra fan kicked in today after I had it switched off for just over a month. Normally the fan is never on so I am not sure why it came on after this period of time being switched off; it was flowing 17A at 28V though. Anyway, noise levels, the fan is installed in the cockpit locker against the bulkhead that backs onto the galley - it was just audible, similar to a computer fan, low volume murmur. It stopped after an hour, the fan is only supposed to come on at high ambient temperatures and I have never been aware of it on before.

Great thanks for this, confirms that Sterling will be the best option.
 
Hi,
I was wondering if anyone has any experience with the Elecsol ABC1220 20Amp battery charger? I have an Elecsol 115ah domestic battery and a standard lead acid 110ah starting battery. Can I use this to charge both batteries or just the domestic? Is the ABC1220 in the same league as the Ctek M series units?
 
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