Battery charging voltage

[Limecc]

A dc-dc buck converter of sufficient power rating is a cheap way to overcome this problem.

You can buy smaller ones without a display, set the desired output voltage (ie 14.4v), then waterproof/encapsulate it. The one pictured is about 50mm long, you can mount it near your battery.

[Pikey Dave]

Originally Posted by Limecc

A dc-dc buck converter of sufficient power rating is a cheap way to overcome this problem.

You can buy smaller ones without a display, set the desired output voltage (ie 14.4v), then waterproof/encapsulate it. The one pictured is about 50mm long, you can mount it near your battery.

I have a similar one on my Poover lithium. Works a treat.

[kaman]

I tried the outboard charging circuit yesterday with a 12ah battery.
Monitoring the charge going in it varied from 15v - 19v.
At the business end the battery voltage topped out at 16.4v
An improvement over the smaller 7ah battery which registered 18.9v.
I've ordered a small voltage suppressor to dial down the voltage going into the battery.
If it works as it should it will be four quid well spent.

[Fenlander]

>>>ordered a small voltage suppressor

Best option. Regulating charge voltage by battery sizing is a hit and miss affair... amazed the Tohatsu guy didn't advise a regulator.

[kaman]

Originally Posted by Fenlander

>>>ordered a small voltage suppressor

Best option. Regulating charge voltage by battery sizing is a hit and miss affair... amazed the Tohatsu guy didn't advise a regulator.

They've not phoned me back regardingmy query.
He promised he'd get back by Tuesday afternoon.
When questioned he said the kit was a rectifier/ regulator.
20volts ain't regulated in my book

[jeffstevens763@g]

Originally Posted by kaman

I tried the outboard charging circuit yesterday with a 12ah battery.
Monitoring the charge going in it varied from 15v - 19v.
At the business end the battery voltage topped out at 16.4v
An improvement over the smaller 7ah battery which registered 18.9v.
I've ordered a small voltage suppressor to dial down the voltage going into the battery.
If it works as it should it will be four quid well spent.

Have you a link to the voltage suppressor gordon please cheers

[kaman]

Hi Jeff hope you are well.
Here is the link

https://www.ebay.co.uk/itm/LED-LM259....m46890.l49292

[jeffstevens763@g]

Thanks mate all good here hope you and yours are too

[jeffstevens763@g]

Can you get these in a waterproof sealed resin box ?

[Limecc]

Originally Posted by jeffstevens763@g

Can you get these in a waterproof sealed resin box ?

You can buy a little plastic box for it and fill it with silicon sealant? Otherwise RS components sell potting resin.

I'd be a little concerned that the item linked is only 2A power rating. The 5A converter I purchased didn't cost much extra and was about the same physical size.

[Pikey Dave]

Originally Posted by Limecc

You can buy a little plastic box for it and fill it with silicon sealant? Otherwise RS components sell potting resin.

I'd be a little concerned that the item linked is only 2A power rating. The 5A converter I purchased didn't cost much extra and was about the same physical size.

Careful with the Silicone, you need a neutral curing type. Most is acetoxy curing (hence the strong vinegar smell) this is acidic & will attack the PCB. Mine’s just mounted in an IP65 box.

[jeffstevens763@g]

I was having a look it’s a mine field thousands of the things

[Limecc]

Originally Posted by jeffstevens763@g

I was having a look it’s a mine field thousands of the things

Try Amazon

[Pikey Dave]

Originally Posted by jeffstevens763@g

I was having a look it’s a mine field thousands of the things

This is the one I bought Jeff, so far so good.

ARCELI Buck Boost Converter Display, DROK Buck-Boost Board DC 5.5-30V 12v to DC 0.5-30V 5v 24v Adjustable Constant Current Voltage Step UP Down Voltag https://www.amazon.co.uk/dp/B07MY399..._CgS2TbwQXqrj7

[jeffstevens763@g]

thanks lads its just I'm a bit jittery of an open circuit board there are waterproof ones but i dont see them at the voltages you've got ill do some more delving. how would these you have fair if encapsulated in potting compound heat wise

[Pikey Dave]

Originally Posted by jeffstevens763@g

thanks lads its just I'm a bit jittery of an open circuit board there are waterproof ones but i dont see them at the voltages you've got ill do some more delving. how would these you have fair if encapsulated in potting compound heat wise

There’s heat generated, hence the heatsink, personally I wouldn’t pot it. Just get a small IP55+ adaptable box & some small compression cable glands. You could get a tin of conformable coating & give it a spray over. My beloved Metect would do the job.

[jeffstevens763@g]

ill have a look Dave cheers

[jeffstevens763@g]

any good?

https://www.wish.com/product/5dd7af6..._BwE&share=web

[Pikey Dave]

Originally Posted by jeffstevens763@g

any good?

https://www.wish.com/product/5dd7af6..._BwE&share=web

That’s taking me to Wish website Jeff, & wants me to install the app. I’ve stopped using wish after a couple of bad experiences. I bought mine off Amazon for around a tenner.

[jeffstevens763@g]

Originally Posted by Pikey Dave

That’s taking me to Wish website Jeff, & wants me to install the app. I’ve stopped using wish after a couple of bad experiences. I bought mine off Amazon for around a tenner.

same thing Dave
https://www.ebay.co.uk/itm/402772196...wAAOSwlXFgZFmX