Will Honda 2000 supply MSH 3012's charger?

The Honda is not big enough.
Trying to run a bigger load like your charger will result in the Honda tripping its breaker and/or supplying low voltage which will destroy your charger and if you keep doing it, may damage the Honda as well.
You don't want to do this.

If you have a remote for the Magnum, you can program the charge input current to lesser amps. Off a single blue 2000 watt, I set for 13a and my MS2812 can hit 100 amps charging current into a depleted bank on a cold day.

I recommend saving input current as one of your FAV settings.

Honda is not large enough to put 125 amps into the battery. Of course the Honda can fully charge the battery... you just need to dial down the amps to about 80 and you should be fine.

I believe the 80 percent is 80 percent of the 125 maximum amps or 100 amps maximum charge rate. Honda might hold this charge level but I think you are better at 60 or 70 percent that would give 75 or 87.5 amps. It just takes longer. Magnum does not stop charging at any specified battery level.

The charging rate is not linear unless you have a lithium battery. With lead-acid you are looking at 2 to 4 hours to get 90 percent charged. The last 10 percent will take another 2 to 4 hours.

Thanks. I forgot to mention, the MSH 3012 has a "shore power" setting, which I set to 15amps max when using the Honda 2000. I'm studying this, but I gather this setting should match the Honda 2000's circuit breaker rating. Also, my bank is 800AH AGM; 4 (6) volt Fullriver DC-400-6s.

I gather the max charge rate at 80% is .8*125 or 100 max. With shore power on max 15, the Honda's breaker doesn't trip, and the Magnum display inside says 90-100 dc amps when the batterires are in bulk.

It would appear these setting prevent damage (I suppose). It just seems to take forever, especially the last 5% of battery capacity while in absorption.

I guess I'm tryign to understand whether an Onan 3.6k would be any faster. If the onan ran at 125 dc amps, I guess that's 25% faster in bulk perhaps, but would either generator be faster during that last 5% absorption phase, when the batteries seem to accept only what they need, regardless of the DC amps being thrown at them.

$3,500 for an onan, when I already own a Honda 2000, seems like a lot. It's hard for me to quantify the marginal charging time.

Magnum has a table for input amps vs charger output. I recommend consulting that chart. There is no output amps adjustment, that part is automatically computed.

GordonThree wrote:
If you have a remote for the Magnum, you can program the charge input current to lesser amps. Off a single blue 2000 watt, I set for 13a and my MS2812 can hit 100 amps charging current into a depleted bank on a cold day.

I recommend saving input current as one of your FAV settings.

mine has a shore power setting to limit what it pulls in. I forgot to reduce this from 30 once and the Honda's breaker tripped and it stopped working.

mine has 10, 15, 20 etc increments and I've used 15 for the Honda and it seems to work without tripping the Honda's breaker.

my AGM batteries need 14.7 for both bulk and absorption, so I just wonder if the magnum's charger gets up to that (it's programmed for these voltage set points) given the Honda's 13.3 amp ac input.

The Onan will only save a few minutes of bulk, nothing during absorption.

Usually people only charge to 90 or 95 percent on generator. Maybe once a week let the Honda idle all day and get to full charge. Solar should come back into play before this is needed. If solar does not get you full by the second day you could run the honda in the morning to get a head start.

Very important to have the proper absorption voltage both on the Magnum and the solar.

I don't know where/why you keeping typing 100vdc
do you mean 100 AMPS dc ?

the magnum line is smart, set it to 12 amp input power ( PianoTuna does this all the time )

and it will work off the honda 2000, you wont get full max charge rate

with 12a *120v input 1440w, you will get approx 1200w charge approx 80 amps

depending on the batteries approx 5-6 hours to get near 100% in the high 90% range

i have a 675 ampHr AGM bank and typically use 150ampHrs over night during the summer with all the fans and the fridge

time2roll wrote:
Honda is not large enough to put 125 amps into the battery. Of course the Honda can fully charge the battery... you just need to dial down the amps to about 80 and you should be fine.

I believe the 80 percent is 80 percent of the 125 maximum amps or 100 amps maximum charge rate. Honda might hold this charge level but I think you are better at 60 or 70 percent that would give 75 or 87.5 amps. It just takes longer. Magnum does not stop charging at any specified battery level.

The charging rate is not linear unless you have a lithium battery. With lead-acid you are looking at 2 to 4 hours to get 90 percent charged. The last 10 percent will take another 2 to 4 hours.

Thanks. Yes, the 80% reduces 125 to 100 from what I see. Given magnum's shore power choices are 10 or 15 (and I'm using 15), it does make sense to dial the "charge rate" down on the magnum, which I assume would cause the charger to draw less from the Honda and keep the Honda happier.

I have AGM batts that will take a C/5 charge, so 800/5 or 160amp charge during bulk. Wow, just seems like it takes forever to get this bank back to 100%. Your time above on average is 6 hours on the generator.

I have 960 watts of solar, and hoping to live with the Honda 2000. I've been told that if I don't get the bank up to 100% at least every 4-5 days, I'll ruin the batteries. Hence, my concern about not having an onan.

I'm just starting to use my system, so I'll keep the Honda 2000 and watch the bank's status like a hawk until I'm better at all this solar stuff.

More amps only affects bulk. It won't speed up absorb or float those are constant voltage.