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 > Ryobi 900 Watt Propane Generator

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pnichols

The Other California

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Posted: 04/13/19 10:20am Link  |  Quote  |  Print  |  Notify Moderator

When figuring out if a given small size generator will power a battery charger trying to charge a given state-of-charge battery bank at a given voltage at a resutting current demand from the battery bank - the situation changes quite a bit if you adjust one "given" ... the battery charger's output voltage.

For instance, when our RV's AGM 230 AH battery bank is around 50% discharged, our little 650 watt Honda will power our RV's 45 amp converter just fine for charging of the batteries ... because the converter's output voltage is only around 13.6 volts ... which means that the battery bank is only wanting 10-12 amps from the converter - which of course the little Honda handles just fine.

HOWEVER, under the above conditions one 5-6 hour run of the little Honda (1/2 gallon of gas per tank) will only partially charge the battery bank. This means we will have to fully charge the battery bank some other way every 3-4 charge cycles so as to properly care for the batteries. Since we're not squatter campers, every few days we fully charge our battery bank via the engine's alternator when going to the next camping spot.

I guess the ultimate would be a charger with an adjustable output voltage, so that you could adjust downwards it's output voltage a bit under 14.XX volts to the point where a small generator doesn't quite stall from current overload. This would allow a small generator to be used for partially charging of any size battery bank between full charges via some other method. [emoticon]


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road-runner

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Posted: 04/13/19 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

pnichols wrote:


I guess the ultimate would be a charger with an adjustable output voltage, so that you could adjust downwards it's output voltage a bit under 14.XX volts to the point where a small generator doesn't quite stall from current overload. This would allow a small generator to be used for partially charging of any size battery bank between full charges via some other method. [emoticon]
Another ultimate solution is a charger that lets you set the maximum amps it will draw from the AC input. I use a prosine 2.0 for exactly this reason, just for the charger. Haven't used the inverter yet. I could use the inverter, just haven't needed to yet.


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wa8yxm

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Posted: 04/13/19 04:10pm Link  |  Quote  |  Print  |  Notify Moderator

road-runner wrote:

Quote:

they tell me that a Honda 1000 can only handle a 60 amp.
"They" would be correct if the statement were about an eu2000i. A non-pf-corrected 60 amp converter in boost mode is about 50 VA short of 1600, the eu2000i's max continuous rating. (The numbers will vary a bit based on efficiency and pf values).


Yes.. And that is the EXACT combination I was basing it on.


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time2roll

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Posted: 05/11/19 06:13pm Link  |  Quote  |  Print  |  Notify Moderator

Ran the Ryobi first time today. Really like the light weight and the propane fuel. Seemed to be as quiet as my old Honda 1000 but it has been a while since that was sold. Anyway seemed virtually the same at idle but the noise level did not seem to ramp up as much as the Honda. Runs noticeably cleaner than gasoline.

Barely came off idle to power the 20 amp charger. Ran the Xantrex XADC-40 just fine for a solid 20 minutes putting 41 amps into the battery. Xantrex is PF corrected. Then plugged in the 35 amp WFCO. Was putting 38/39 amps into the battery maybe 20 seconds before the generator cut power and illuminated the overload indicator.

Looks like I might be swapping the Xantrex back in.


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BFL13

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Posted: 05/23/19 09:55am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Ran the Ryobi first time today. Really like the light weight and the propane fuel. Seemed to be as quiet as my old Honda 1000 but it has been a while since that was sold. Anyway seemed virtually the same at idle but the noise level did not seem to ramp up as much as the Honda. Runs noticeably cleaner than gasoline.

Barely came off idle to power the 20 amp charger. Ran the Xantrex XADC-40 just fine for a solid 20 minutes putting 41 amps into the battery. Xantrex is PF corrected. Then plugged in the 35 amp WFCO. Was putting 38/39 amps into the battery maybe 20 seconds before the generator cut power and illuminated the overload indicator.

Looks like I might be swapping the Xantrex back in.


41 x ?14.2? = 582w output at say 85% = 685w input and with 0.98PF = 699VA

35 x 14.4 = 504w output at say 85% = 593w input and with 0.7PF = 847VA

When the Xantrex gets the battery to 14.2 it is at the gen's 700. If the Xantrex can get the battery higher than 14.2, it will go over that 700 a little.


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time2roll

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Posted: 05/23/19 10:28am Link  |  Quote  |  Print  |  Notify Moderator

I just put a load on the battery to check immediate performance. Battery was about 12.2/12.4 volts feeding my electric vehicle with maybe 1400 watts.

Very good point that the XADC-40 could overload the generator as peak voltage and current is reached. IIRC there was some voltage sag (0.2?) at the transition to absorption and the start of amps tapering. I was actually expecting the XADC-40 to overload the generator.

Not really a full test to fully recharge a low battery. Just wanted to verify what works. XADC is out of production so not much help for anyone looking at converters.

BFL13

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Posted: 05/23/19 10:58am Link  |  Quote  |  Print  |  Notify Moderator

It is easier on the generator to run a charger doing power supply (such as on a battery that is being drawn down ) than it is to charge the same battery.

That would be from the battery voltage being lower under load instead of higher while being charged.

bestconverters still advertises those TC40s, but it says it is a new version. Expensive!

http://www.bestconverter.com/Xantrex-TrueCharge2-Chargers_c_111.html

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