pianotuna wrote:
CA Traveler wrote:
Are you sure? Method 3 requires equal amps and voltage from all 3 batteries. How are you doing this with one battery located 8' away?
A 900W MW draws 65A+ and not the best for starting batteries which a Marine battery is - ie a compromised starting battery. Might be OK and might cause a low voltage fault.
Hi CA Traveler,
He could do method #3 if the leads to the battery bank go to a buss bar that is 5 feet from any battery. i.e. all wires the same length.
I'd suggest that a 900 watt microwave may draw about 100 amps. I know my 1570 watt Dometic draws 185 amps.
I was able to successfully operate the Dometic microwave on 3 Marine jars for more than a few minutes. I have two banks--and one was 3, the other was 4 batteries. Switching allowed me to do either/or/both/off.
Yes, Method #3...All my positive wires are connected on a buss bar, and all my negative wires are connected on a different post...HOWEVER...the wire lengths are different. It's the best I can do currently. I'll do a voltage check at each battery to see if there is a difference when the batteries are in bulk charge (highest amps trying to enter batteries and therefore largest potential voltage drop). If one of the batteries is significantly lower in voltage (...how much is too much? 0.2v? 0.3v?) I can run a 2nd cable to that battery and I suspect that will fix the issue.
Actually, the two batteries that will be added (one already added) have much longer wires BUT the cables are a fair amount thicker so that will help already with any voltage difference during charge.
Make sense?
Chris
