correct charging voltage......

VicS

Well-known member
Joined
13 Jul 2002
Messages
48,509
Visit site
......for a 24v battery bank. What voltage should be produced by the alternator?

Cheers,

C.

twice the figures for 12 volts

A minimum of 27.6 and a maximum of 28.8

around 28.4 would be nice

Although it depends on the battery type
 

VicS

Well-known member
Joined
13 Jul 2002
Messages
48,509
Visit site
The regulated voltage is 26 to 32 volts.

26 would not be much good for battery charging. 32 would be too high, other than briefly. If it can be reliably controlled to closer limits maybe OK
 

Sy-Revolution

Active member
Joined
4 Apr 2006
Messages
1,281
Location
On board -N/B Berengaria, Cambridge
Visit site
I read that the voltage output can be controlled electronically.
The only English speaking reference I have found on the net is here, post about half way down:

http://www.navitron.org.uk/forum/index.php/topic,5326.0.html

I've tried to join that forum to ask Billi directly about his, but they have a human verification system for new members and the person who is tasked with the job aint doing it. waited over a week now.

index.php


C.
 

Gumpy

Well-known member
Joined
12 Dec 2006
Messages
1,574
Location
A far corner of Little England
Visit site
Thanks Vic, I'm interested in one of these:

http://www.ebay.de/itm/1-9KW-DIESEL...en_Heimwerker_Generatoren&hash=item27bfe6f231

For my new narrowboat liveaboard project. Looks like it might do the trick.

Wont be a popular choice with anyone nearby on the canal
Air cooled and it will be noisy.
Ran an air-cooled genset on the barge, it was a real pain keeping it cool enough in the summer, ended up destroying it........
I now have a beta twin driving a Makron SL unit its so quiet compared to the previous unit.
As for charge voltages I have two settings here one for when away from the moorings and that is 29.7v high but works and one for on the moorings 28.2v as I can leave it charging for ages without worrying.

J
 

Sy-Revolution

Active member
Joined
4 Apr 2006
Messages
1,281
Location
On board -N/B Berengaria, Cambridge
Visit site
The listing states 68dB at 6m which didn't sound (excuse the pun) too bad to me, most seem to be 71 at 7m. I'm planning to fit inside the engine room with exhaust led outside.
I'll be fitting soalr panels too so hopefully won't run it so much in summer.

Thanks for the infos everybody.

Cheers,

C.
 

VicS

Well-known member
Joined
13 Jul 2002
Messages
48,509
Visit site
Initially, yes. But, as I'm sure Vic knows, to charge a lead-acid battery the voltage should not be constant. The only way to use this generator is via a charger, it isn't mean to charge batteries.

You might just have to use it like you would an engine driven alternator but at least you'd be able to ramp the volts up slowly by hand to give an appropriate maximum current and then when charged the volts could be reduced manually to a float level.
 

Sy-Revolution

Active member
Joined
4 Apr 2006
Messages
1,281
Location
On board -N/B Berengaria, Cambridge
Visit site
The charger alone is £535.42 (from yachtbits) and supplies 30 amps. A descent 5k diesel genset is going to be over £1200. I want to avoid using petrol if I can, fire risk is one reason the other is having to store/buy separate fuels for engine/genny etc. The boat is already fitted with a 1600w Sterling inverter/charger, but we'll not have a mains connection most of the time.

I may well go for a diesel 240v genset as well (for power tools/welder etc) but I'm gambling that for the money I'll get more amps per buck/hour into the batteries with the 24v genny. We'll also be fitting a descent solar array + wind gen (maybe) to float charge the batteries in anything except winter.

Cheers,

C.
 
Top