does it come with any fuses?

No it does not come with any fuses.

It had 3 negative posts. i need 4. can i stack two negative connections. solar charger and dc to dc charge on one post?

If you are talking about a common ground and the bus bar is connected to ground, you can stack multiple ground connections to any of the three posts. However, I suggest you seek some advice from someone locally if you are unfamiliar with electricity and solar power, because I may not fully understand your question.

Is it compatible with 24v system?

Most likely it would be totally fine, depending on the amperage draw. Learn ohms law if you aren't familier. If you need 30 Amps of 24volt, you would use a 12 volt fuse rated for 15 Amps.

Color	blue/sea
Size	One Size
Style	Pumps
connector-type	Screw
Height	3 inches
Length	9 inches
Weight	1 Pounds
Width	12 inches
Material Type	Plastic
Number of Items	1
Number of Pieces	1
Included Components	SAFETY HUB FUSE BLOCK 150 RBS
Batteries Included?	No
Brand	Blue Sea Systems
Department	unisex-adult
Manufacturer	Blue Sea Systems
Item model number	7748
Product Dimensions	22.86 x 30.48 x 7.62 cm; 453.59 g
ASIN	B0053BTSEK

FUSE BLOCK SAFETYHUB 150

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