SLA battery charging with PWM but which frequency

[showtime]

Hi chuck,

Thank you for charging ideas wihch i know. I want to know some details about mackrackit's booster charger.

Will I see normal charging values like conventional circuits. I'm trying to say step by step that is important for me:
-I assume I have boost circuit which is controlled by PIC or not. It boost's the voltage to 14.2V when PV give me i.e 9V. Therefore I always measure 14.2V without the battery. Because the circuit adjust the output via feedback.
-We sure we connect the battery to the PV, voltage is decreased. for exmple 10-12V. If this is OK

-Will always Our buck-bust circuit adjust itself to 14.2V constant voltage during charging?.

I know I'm your headache but forgive my experience and my bad English.

[mackrackit]

-We sure we connect the battery to the PV, voltage is decreased. for exmple 10-12V. If this is OK

Yes.

-Will always Our buck-bust circuit adjust itself to 14.2V constant voltage during charging?.

A buck- boost circuit would. The LM2588 is for boost, so when the PV voltage becomes higher than 14.2 the LM2588 will basically shut off. The voltage from the PV will go straight through the inductor and diode to the battery ( minus the inductor resistance and diode drop ). This is where the PIC could help. Some way to monitor the voltage at the battery. When the battery is "FULL", shut the whole thing off or switch to a maintaining "FLOAT" voltage. This all depends on what the battery is used for. Backup power - a float charge . Charge the battery to use daily - shutting the charger off until the voltage drops to 13? might be good for you.

[showtime]

I don't know how much i can thank you. I understood everything.
Last night I see MPPT charging technic. I was happier. They are famous style to get maximum efficiency. You are expert.

Best regards.

[mackrackit]

Glad you got it, but I am no expert. Thanks for the compliment though

[iw2fvo]

Dave,

is there any MPPT PV> battery Charger project available ?
Possibly using PIC and PICbasic !
Thanks
Ambrogio

[mackrackit]

I can not think of any on this forum. I seem to remember seeing one on the Home Power magazine web site a few years ago.

[Heckler]

here are several BUT none of them use a PIC micro or PBP...


http://www.repeater-builder.com/backup-power/pdfs/automatic-sealed-bat-chrgr.pdf

http://adventure-radio.org/ars/pages...ext/N7CEE.html

http://www.batteryspace.com/leadacid...sfloating.aspx

http://www.theheathkitshop.com/page4/page4.html