Micro CoGen.

Here is another about the same size and they are claiming 600 watts. And they throw in a rectifier as well..

https://www.amazon.com/Permanent-Generator-Alternator-Generators-Rectifier/dp/B0BJVTNM1W/ref=psdc_3754021_t1_B0BG47RMGV?th=

Quote from: Tom Reed on September 13, 2023, 02:57:42 PMThat sounds like a good plan. My 6/1 puts out a steady 3 kw with brief loads of 3.6 kw when the microwave is on. I just went and checked to see what's available these days for PM 48v generators and there is quite a bit to choose from and some are dirt cheap! https://www.amazon.com/Alternator-Gearless-Permanent-Insulation-Horizontal/dp/B0BG47RMGV/ref=d_m_crc_dp_lf_d_t1_sccl_2_2/139-6785606-9829854?content-id=amzn1.sym.5d471845-5073-424b-b27b-c0676f48a016&pd_rd_i=B0BG47RMGV&psc=1

I dont like those amazon sellers.. They are saying that it puts 6000 watts..??

That is hard to believe.. I bet it is more like 350 watts.

RJ,
When I had that thing running when mounted on the Ford LRG425, I believe it put out around 48 volts unloaded, un-rectified at 1800 rpm's. I can't remember.

If I remember correctly, wasn't there another PM head mounted on the end where the pulley is mounted?

Wow, it's been so long ago. Time sure flies.

Here is a link:
https://www.shawneepower.com/
Eric is the owner. He has the rights to build these. I spoke with him some time ago and he mentioned that they are somewhat different than his. Eric might be able to help you figure it out.

Bob G. has two of those PMG heads also. But, I'm not sure if they are the same as what you have.

Bob and Eric at Shawnee Power would probably be the most help.

Oh, Eric is a member on this forum.

Quote from: Henry W on November 27, 2022, 05:58:37 PMThe engine that powered the Daul unit was a Ford LRG-425 industrial engine.

It has a continuous rating of 72 hp with LP (propane)

Here are the specs:

Gasoline (corrected per SAE J1995)

Fuel Specification.

.87 A.K.I.

Rated Power @ 3600 RPM ....

.Intermittent: 74 HP (55 kW)

Continuous: 63 HP (47 kW)

Peak Torque @ 1800 RPM.

.Intermittent: 123 Ft. Lbs. (167 Nm)

Continuous: 104 Ft. Lbs. (141 Nm)

Power @ 1800 RPM.

.Intermittent: 42 HP (31 kW)

Continuous: 36 HP (27 kW)


Natural Gas (corrected per SAEJ1995)

Fuel Specification.

.1050 BTU/FT3

Rated Power @ 3600 RPM.

.Intermittent: 74 HP (55 kW)

Continuous: 63 HP (47 kW)

Peak Torque @ 2600 RPM.

.Intermittent: 115 Ft. Lbs. (156 Nm)

Continuous: 98 Ft. Lbs. (133 Nm)

Power @ 1800 RPM.

.Intermittent: 39 HP (29 kW)

Continuous: 33 HP (25 kW)


Liquefied Petroleum Gas (corrected per sae J 1995)

Fuel Specification.

.HD-5

Rated Power @ 3600 RPM.

.Intermittent: 84 HP (62 kW)

Continuous: 72 HP (54 kW)

Peak Torque @ 1800 RPM.

.Intermittent: 133 Ft. Lbs. (180 Nm)

Continuous: 113 Ft. Lbs. (153 Nm)

Power @ 1800 RPM.

.Intermittent: 45 HP (34 kW)

Continuous: 38 HP (28 kW)

\
Did you ever run the engine with the heads on it? I'm  curious if it was indeed 1800 rpm, I've been doing some testing at at ~1250 rpm I'm getting 25 bolts no load, I put a small load on it and was at about 21 volts. Motor did slow down some. I started a thread in the PMG sub forum.

Quote from: Tom Reed on September 13, 2023, 02:57:42 PMThat sounds like a good plan. My 6/1 puts out a steady 3 kw with brief loads of 3.6 kw when the microwave is on. I just went and checked to see what's available these days for PM 48v generators and there is quite a bit to choose from and some are dirt cheap! https://www.amazon.com/Alternator-Gearless-Permanent-Insulation-Horizontal/dp/B0BG47RMGV/ref=d_m_crc_dp_lf_d_t1_sccl_2_2/139-6785606-9829854?content-id=amzn1.sym.5d471845-5073-424b-b27b-c0676f48a016&pd_rd_i=B0BG47RMGV&psc=1

Yes I have seen those, and yes they are cheap. However, I have yet to see any real world testing on them so I haven't looked at them with any real merit. If you come across any please do share.

That sounds like a good plan. My 6/1 puts out a steady 3 kw with brief loads of 3.6 kw when the microwave is on. I just went and checked to see what's available these days for PM 48v generators and there is quite a bit to choose from and some are dirt cheap! https://www.amazon.com/Alternator-Gearless-Permanent-Insulation-Horizontal/dp/B0BG47RMGV/ref=d_m_crc_dp_lf_d_t1_sccl_2_2/139-6785606-9829854?content-id=amzn1.sym.5d471845-5073-424b-b27b-c0676f48a016&pd_rd_i=B0BG47RMGV&psc=1

Well hiccup number one came to fruition 

Rectifier came in a day early, my hasty calculations implied the voltage would be the sum the of the three phases, this isn't correct its the L-L-L mean * 1.35, so in reality spinning at the current speed of ~1250 rpm I'm only getting about 25v DC. Which is interesting because I was told these ran at 1800 RPM. My small motor can't spin the head any faster without billowing some smoke. I have a larger motor but not the correct pulley's for them.

Quote from: Tom Reed on September 12, 2023, 08:20:16 PMThat might not be enough engine. The general rule is 2hp per KW. 200 x 48 = 9600w or almost 10 KW or 20hp. Do you have a way to limit the current?

Forgot to answer your question, yes the plan is to use an MPPT controller from the rectified AC to charge the batteries/loads. I will use that to limit the current. 100 Amps or 4800 watts or so should be sufficient, or if I go by full charge on a 48v Lifepo4 pack that's ~56 volts or 5600 watts about the limit of the 12/2. Otherwise I would probably need to piggy back two MPPT controllers together. I don't think the complexity of two controllers is worth the trouble.

Absolutely I won't have enough engine to tax this unit. That's the beauty of the setup. With a small (relatively) battery bank it will act as giant flywheel accepting larger short duration loads. During low load time the engine can spin down to a much lower RPM to maintain the battery bank charge.

That might not be enough engine. The general rule is 2hp per KW. 200 x 48 = 9600w or almost 10 KW or 20hp. Do you have a way to limit the current?