Why won't my inverter put out?
I feel there should be a 'That's what she said' joke in here somewhere... I booked a camping site that I thought had hookups, but when I got here: no hookups. I needed more juice than my house ...
Forum Discussion
Good morning, all!
Info from last night:
It took 2.5 hours to charge my 3 AGM batteries: 1@ 200 amps, 2@ 100, none empty, plus laptop. At that point starter battery was at 12.19, so I ran van for another half hour and went to bed. Nothing ever got very hot.
Luckily I am in a cg where the sites are far apart and it's cold in the evening, so ppl are in their trailers. I felt bad about the noise.
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Oh, dang, I am so used to AGMs that I forget wet batteries are different!
No, it was with the same inverter loads as when it was 13.87.
Ok.
The smaller ones are in series, used for powering some 24v equipment in the daytime.
Thanks!
Really? Having to charge them seperatly, vs 3 at a time with the 30a charger, actually sounds slightly slower. But I am easily confused.
Info from last night:
It took 2.5 hours to charge my 3 AGM batteries: 1@ 200 amps, 2@ 100, none empty, plus laptop. At that point starter battery was at 12.19, so I ran van for another half hour and went to bed. Nothing ever got very hot.
Luckily I am in a cg where the sites are far apart and it's cold in the evening, so ppl are in their trailers. I felt bad about the noise.
---
jrnymn7 wrote:
Naio,
I noticed a couple of things in your last few updates.
You said the van's starter battery was sitting at 12.68v. In all likelihood, the battery was full (or at least very near full).
Oh, dang, I am so used to AGMs that I forget wet batteries are different!
When you were charging the starter battery, voltage from the alternator was at 14.5v... this is a good thing, and with a small load, and the peukert effect, voltage was 13.87... so all good. But then you said you checked on things, and "Chassis battery back up over 14". ??? Was this at rest (shortly after being charged), or while being charged? If at rest, that is surface charge, fine. But if while still charging, voltage had dropped significantly (from 14.5) then that's not a good thing.
No, it was with the same inverter loads as when it was 13.87.
As others have stated, it may be better to go directly from the alternator to the agm's. All that switching, from dc to ac, back to dc, is causing a lot of waste/heat.
Ok.
And I would have those two 50a agm's in parallel, if you don't already, both for charging and discharging. The 100a I would leave on its own, and use one 100Ah bank while charging the other.
The smaller ones are in series, used for powering some 24v equipment in the daytime.
At night you could use both banks... one for the fridge, the other for heat. Use the larger inverter for the fridge (provided it works ok wih the msw), and a small inverter for the heat pads, etc.
As for a clamp meter, Home Depot has a wide selection, but you'll get a better price on eBay. Seeing as you're now moving to a site with hook-ups, it can wait. Order one on-line now, and you'll have it before your next outing. Plus you can test things at home, before leaving, to see what works best. nudge nudge wink wink ;)
I have this one
Thanks!
Hopefully you can get at least 25a from the alternator to the batts, for a decent C/4 charge rate on a 100Ah bank. If that's the case, you'll be able to do a 50-80% in just over an hour, and a 50-90% in about 2 hrs. At 14.5v, you'll be at about 90% soc when amps taper to about 5a.
Really? Having to charge them seperatly, vs 3 at a time with the 30a charger, actually sounds slightly slower. But I am easily confused.
